充电桩互联互通 hmac-md5加密算法 HmacMd5Signatureimport java.nio.charset.StandardCharsets; import java.security.MessageDigest; import java.util.Arrays; public class HmacMd5Signature { private static final byte IPAD = 0x36; private static final byte OPAD = 0x5C; public static String hmacMd5(String data, String sigSecret) throws Exception { byte[] keyBytes = sigSecret.getBytes(StandardCharsets.UTF_8); byte[] dataBytes = data.getBytes(StandardCharsets.UTF_8); byte[] paddedKey = Arrays.copyOf(keyBytes, 64); byte[] xorIpad = new byte[64]; byte[] xorOpad = new byte[64]; for (int i = 0; i < 64; i++) { xorIpad[i] = (byte) (paddedKey[i] ^ IPAD); xorOpad[i] = (byte) (paddedKey[i] ^ OPAD); } MessageDigest md = MessageDigest.getInstance("MD5"); md.update(xorIpad); md.update(dataBytes); byte[] hashIpad = md.digest(); byte[] finalData = new byte[64 + hashIpad.length]; System.arraycopy(xorOpad, 0, finalData, 0, 64); System.arraycopy(hashIpad, 0, finalData, 64, hashIpad.length); md.reset(); md.update(finalData); byte[] hmacMd5 = md.digest(); StringBuilder result = new StringBuilder(); for (byte b : hmacMd5) { result.append(String.format("%02x", b)); } return result.toString().toUpperCase(); }